The Nest Thermostat E is a smart thermostat that turns itself down when youre away. It helps you save energy and keep your home comfortable. You can control it from anywhere with the Nest app and it works with Alexa and Assistant so you can adjust the temperature with your voice. Nest Temperature Sensor communicates the temperature to the Nest Thermostat E. You can put different Nest sensors in different rooms then use the Nest app to choose the exact temperature you want the room to be along with a time of day. And its simple to install yourself - just hang it on the wall or place it on a shelf. 1 Remote control and mobile notifications require working internet and Wi-Fi. 2 Energy savings are not guaranteed and depend on energy usage weather and other factors. 3 Independent studies showed that Nest thermostats saved people an average of 10% to 12% on heating and 15% on cooling. Based on typical energy costs weve estimated average savings of 131 to 145 a year. Individual savings are not guaranteed.